here is a wonderful experiment to find whether
an egg is fresh or rotten. for this you need a large bowl of water, one fresh egg, one
which is 15 days old and third which is 30 days old. take the fresh egg and place it
in the bowl of water and the fresh egg will sink to the bottom. this is the test for freshness
of the egg. take an old rotten egg and place it in the bowl of water, it will float at
the top. take an egg which is around 2 weeks old, place it in water, it will partially
float. so the test will find out whether the egg is fresh or rotten is to float it in water.
the fresh egg will sink and the rotten egg which has a lot of accumulated gas inside
becomes lighter and it will float on the surface.